import fetch from 'dva/fetch';
import hash from 'hash.js';
import { notification } from 'antd';
import dva from '../dva';
const codeMessage = {
    200: '服务器成功返回请求的数据。',
    201: '新建或修改数据成功。',
    202: '一个请求已经进入后台排队（异步任务）。',
    204: '删除数据成功。',
    400: '发出的请求有错误，服务器没有进行新建或修改数据的操作。',
    401: '用户没有权限（令牌、用户名、密码错误）。',
    403: '用户得到授权，但是访问是被禁止的。',
    404: '发出的请求针对的是不存在的记录，服务器没有进行操作。',
    406: '请求的格式不可得。',
    410: '请求的资源被永久删除，且不会再得到的。',
    422: '当创建一个对象时，发生一个验证错误。',
    500: '服务器发生错误，请检查服务器。',
    502: '网关错误。',
    503: '服务不可用，服务器暂时过载或维护。',
    504: '网关超时。'
};

const checkStatus = (response: any) => {
    if (response.status >= 200 && response.status < 300) {
        return response;
    }
    const errortext = codeMessage[response.status] || response.statusText;
    notification.error({
        message: `请求错误 ${response.status}`,
        description: errortext
    });
    const error = new Error(errortext) as any;
    error.name = response.status;
    error.response = response;
    throw error;
};

const cachedSave = (response: any, hashcode: any) => {
    const contentType = response.headers.get('Content-Type');
    if (contentType && contentType.match(/application\/json/i)) {
        response
            .clone()
            .text()
            .then((content: any) => {
                sessionStorage.setItem(hashcode, content);
                sessionStorage.setItem(
                    `${hashcode}:timestamp`,
                    Date.now() as any
                );
            });
    }
    return response;
};
export default function request(url: any, option: any) {
    const dispatch = dva.getDispatch();
    dispatch({
        type: 'layout/loading_show'
    });
    const options = {
        expirys: false,
        ...option
    };
    const fingerprint =
        url + (options.body ? JSON.stringify(options.body) : '');
    const hashcode = hash
        .sha256()
        .update(fingerprint)
        .digest('hex');

    const defaultOptions = {
        credentials: 'include'
    };
    const newOptions = { ...defaultOptions, ...options };
    if (
        newOptions.method === 'POST' ||
        newOptions.method === 'PUT' ||
        newOptions.method === 'DELETE'
    ) {
        if (!(newOptions.body instanceof FormData)) {
            newOptions.headers = {
                Accept: 'application/json',
                'Content-Type': 'application/json; charset=utf-8',
                ...newOptions.headers
            };
            newOptions.body = JSON.stringify(newOptions.body);
        } else {
            // newOptions.body is FormData
            newOptions.headers = {
                Accept: 'application/json',
                ...newOptions.headers
            };
        }
    }

    const expirys = options.expirys && 60;
    // options.expirys !== false, return the cache,
    if (options.expirys !== false) {
        const cached = sessionStorage.getItem(hashcode);
        const whenCached = sessionStorage.getItem(
            `${hashcode}:timestamp`
        ) as any;
        if (cached !== null && whenCached !== null) {
            const age = (Date.now() - whenCached) / 1000;
            if (age < expirys) {
                const response = new Response(new Blob([cached]));
                return response.json();
            }
            sessionStorage.removeItem(hashcode);
            sessionStorage.removeItem(`${hashcode}:timestamp`);
        }
    }
    // @ts-ignore
    return fetch(url, newOptions)
        .then(checkStatus)
        .then(response => cachedSave(response, hashcode))
        .then(response => {
            if (newOptions.method === 'DELETE' || response.status === 204) {
                return response.text();
            }
            return response.json();
        })
        .catch(() => {});
    // .finally(() => {
    //     setTimeout(() => {
    //         dispatch({
    //             type: 'layout/loading_hide'
    //         });
    //     }, 2000);
    // });
}
